If you need to preserve governor limits regarding the number of API calls in your backup solution, which API should you use?

The Bulk API is specifically designed for handling large volumes of data and is optimized to work efficiently with Salesforce's governor limits, particularly regarding the number of API calls. When tasked with backing up or processing large datasets, the Bulk API allows for batching operations, which means that it can handle multiple records in a single API call. This effectively minimizes the number of API calls made, helping to stay within governor limits.

Furthermore, the Bulk API uses a background process for processing, which improves data handling performance for large volumes and reduces the load on Salesforce's resources. This is especially crucial in backup solutions where efficiency and data integrity are paramount. By utilizing the Bulk API, you can efficiently manage these operations without hitting limits that come into play with more traditional APIs that process records individually, such as the REST and SOAP APIs.